This NxG carbon-wrapped quick-connect snap-change cylinder comes in grey and meets the NIOSH standard. It has a 2216 pounds per square inch pressure rating, 45 standard cubic feet air flow rate, and a 30-minute duration. The pre-filled cylinder measures 23 7/10 overall height x 6 69/100 inches diameter and is suitable for use with NxG2 self-contained breathing apparatus.